Enhanced coupled elasto-plastic-damage models to
Enhanced coupled elasto-plastic-damage models 231 The local coupled elasto-plastic-damage model 1 requires the following six material constants to capture the cyclic tensile behaviour E ν κ0 α β k and one hardening yield stress function.
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PLASTIC VERSUS ELASTIC DESIGN OF STEEL STRUCTURES
· plastic stress-strain model as shown by the dashed line in Figure 1. This model is assumed for all subsequent analyses in this chapter. More complex models can be used in the analyses if preferred using the same basic principles. As can be seen from Figure 1 large deformation can occur beyond the elastic limit. This ability to undergo
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STABILITY OF UNDRAINED DEFORMATION OF
· compression experiments on saturated sands under undrained conditions (e.g. Han and Vardoulakis 1991 ). These experiments indicate that loss of stability (manifested by subsequent localization of deformation into shear bands) occurs at plastic strains significantly higher than the one s corresponding to the state (C) for dense (dilatant) sands
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CONSTITUTIVE ANALYSIS OF LARGE ELASTO- PLASTIC
· The constitutive analysis of elasto-plastically deformed materials by using the multiplicative decomposition of the deformation gradient into its elastic and plastic part. introduced by Lee (1969). has since stimulated great interest in both kinematic and kinetic aspects of elasto-plastic theory. However.
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Elastic and plastic deformations of nickel nanowires under
Abstract Using atomistic molecular dynamics simulation with a Sutton–Chen many body potential we studied the structural evolution and deformation mechanisms of nickel nanowires under homogeneous uniaxial compressions. Nickel nanowires with helical multi-shell structure and fcc-like crystalline structures have been considered. Elastic and plastic behaviors of nickel nanowires under
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Rebecca JanischGoogle Scholar
Amorphization-governed elasto-plastic deformation under nanoindentation in cubic (3C) silicon carbide L Zhao M Alam J Zhang R Janisch A Hartmaier Ceramics International 46 (8)
Get PriceThe Capabilities and Limitations of Linear Elastic Models
Linear elastic models are generally accepted as a reasonable approximation of crustal deformation with magnitude and temporal scales associated with the seismic cycle. However there is little doubt that the large irrecoverable strains (e.g. folding fracturing compaction) associated with fault-related deformation over geologic time scales are not elastic in nature.
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Mechanically induced amorphization of small molecule
Mechanically induced amorphization of small molecule organic crystals Yifei Zeng1 Lorena Alzate-Vargas2 Chunyu Li 2 Rachel Graves3 Jeff Brum3 Alejandro Strachan2 and Marisol Koslowski1 1 School of Mechanical Engineering Purdue University West Lafayette IN United States of America 2 School of Materials Engineering Purdue University West Lafayette IN United
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Amorphization-governed elasto-plastic deformation under
· Amorphization plays an important role in ceramic deformation under mechanical loading. In the present work we investigate the elasto-plastic deformation mechanisms of monocrystalline cubic silicon carbide (3C–SiC) in spherical nanoindentation by means of molecular dynamics simulations.
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Numerical modelling of magma dynamics coupled to
Under these conditions it becomes necessary to consider elasto-plastic modes of melt propagation. Additionally the effect of tectonic deformation of the lithosphere and crust on potential modes of melt extraction is of much interest as many magmatic systems
Get PriceEnhanced coupled elasto-plastic-damage models to
Enhanced coupled elasto-plastic-damage models 231 The local coupled elasto-plastic-damage model 1 requires the following six material constants to capture the cyclic tensile behaviour E ν κ0 α β k and one hardening yield stress function.
Get PriceMechanically induced amorphization of small molecule
· Dislocation dynamics simulations of small molecule organic crystals have been shown to be capable of calculating the strain energy due to severe plastic deformation and predict the amorphization of crystals when the energy exceeds the one of the amorphous phase . In this numerical approach the interface energy between the amorphous and
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Mechanically induced amorphization of small molecule
· Dislocation dynamics simulations of small molecule organic crystals have been shown to be capable of calculating the strain energy due to severe plastic deformation and predict the amorphization of crystals when the energy exceeds the one of the amorphous phase . In this numerical approach the interface energy between the amorphous and
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A linear model of elasto-plastic and adhesive contact
· The proposed model is a linear elasto-plastic adhesive model with the detachment condition governed by the work of adhesion and the normal force-overlap response shown in Fig. 3.Similar to the models of Luding Tomas and Thornton and Ning the normal force drops to a certain negative value (f_ 0 ) when two spheres come into contact at (alpha = 0) due to van der Waals attractive forces.
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Mechanically induced amorphization of small molecule
Mechanically induced amorphization of small molecule organic crystals Yifei Zeng1 Lorena Alzate-Vargas2 Chunyu Li 2 Rachel Graves3 Jeff Brum3 Alejandro Strachan2 and Marisol Koslowski1 1 School of Mechanical Engineering Purdue University West Lafayette IN United States of America 2 School of Materials Engineering Purdue University West Lafayette IN United
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PLASTIC YIELDING CHARACTERISTICS OF A ROD UNDER
· Plastic yielding characteristics of a rod under successively applied torsion and tension loadings By Abu Rayhan Mohammad All This thesis is concerned with the elasto-plastic behaviour of circular rods under combined torsion-tension loading Three aspects of
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PLASTIC VERSUS ELASTIC DESIGN OF STEEL STRUCTURES
· plastic stress-strain model as shown by the dashed line in Figure 1. This model is assumed for all subsequent analyses in this chapter. More complex models can be used in the analyses if preferred using the same basic principles. As can be seen from Figure 1 large deformation can occur beyond the elastic limit. This ability to undergo
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A new approach to elasto-plasticity using energy and
· shortly write P = (Gp) to denote the set of all plastic variables. The major assumption in flnite-strain elasto-plasticity is the multiplicative decomposition of the deformation gradient F into an elastic and a plastic part F = FelastFplast = FelastG (2.1) The main feature of this decomposition is that the elastic properties will depend
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PLASTIC YIELDING CHARACTERISTICS OF A ROD UNDER
· Plastic yielding characteristics of a rod under successively applied torsion and tension loadings By Abu Rayhan Mohammad All This thesis is concerned with the elasto-plastic behaviour of circular rods under combined torsion-tension loading Three aspects of
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Dislocation-mediated shear amorphization in boron carbide
(D) Amorphization under shear deformation initiating from dislocation. In summary we used the depth-sensitive indentation technique to characterize the onset of shear amorphization in B 4 C. Stochastic analysis of the first pop-in events which correspond to the formation of amorphous shear bands reveals the kinetic variables of shear
Get PriceA linear model of elasto-plastic and adhesive contact
· the yield stress and plastic deformation takes place which is governed by the plastic stiffness kp on line CD. f = kp α −α0p (6) The yielding force and deformation are given by Thornton 24 and Johnson 25 . Once the contact is unloaded from point D the path lies on line from D to αp with elastic stiffness ke as given by f = ke α
Get PriceMultiphysics Modeling of a Brittle‐Ductile Lithosphere 1
· Plastic deformation is governed by the classical Kuhn‐Tucker conditions The problem is that of a rising plume and its thermo‐mechanical coupling to the deformation of a visco‐elasto‐plastic lithosphere. A proper understanding of the physics behind rock deformation under crustal temperature and pressure conditions is an
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Atomistic investigation of machinability of
· Specifically the dominant deformation mode of amorphization governing the material removal of monocrystalline 3C–SiC is significantly suppressed in UEVC. In addition crack initialization and propagation observed in OC can be efficiently suppressed by applying ultrasonic vibration of
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A new approach to elasto-plasticity using energy and
· shortly write P = (Gp) to denote the set of all plastic variables. The major assumption in flnite-strain elasto-plasticity is the multiplicative decomposition of the deformation gradient F into an elastic and a plastic part F = FelastFplast = FelastG (2.1) The main feature of this decomposition is that the elastic properties will depend
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A linear model of elasto-plastic and adhesive contact
· the yield stress and plastic deformation takes place which is governed by the plastic stiffness kp on line CD. f = kp α −α0p (6) The yielding force and deformation are given by Thornton 24 and Johnson 25 . Once the contact is unloaded from point D the path lies on line from D to αp with elastic stiffness ke as given by f = ke α −αp (7)
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A linear model of elasto-plastic and adhesive contact
· The proposed model is a linear elasto-plastic adhesive model with the detachment condition governed by the work of adhesion and the normal force-overlap response shown in Fig. 3.Similar to the models of Luding Tomas and Thornton and Ning the normal force drops to a certain negative value (f_ 0 ) when two spheres come into contact at (alpha = 0) due to van der Waals attractive forces.
Get PriceNorthumbria Research Link
· linear deformation regime. Herein we develop a multi-sublayer model based on a stiffness matrix method for analysis of frequency shifts of surface acoustic wave (SAW) and Lamb waves under elasto-plastic deformations. Using this model we calculate the frequency shifts for the cases of both an elastic bending and an elasto-plastic bending.
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Mechanically induced amorphization of small molecule
Mechanically induced amorphization of small molecule organic crystals Yifei Zeng1 Lorena Alzate-Vargas2 Chunyu Li 2 Rachel Graves3 Jeff Brum3 Alejandro Strachan2 and Marisol Koslowski1 1 School of Mechanical Engineering Purdue University West Lafayette IN United States of America 2 School of Materials Engineering Purdue University West Lafayette IN United
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PLASTIC VERSUS ELASTIC DESIGN OF STEEL STRUCTURES
· plastic stress-strain model as shown by the dashed line in Figure 1. This model is assumed for all subsequent analyses in this chapter. More complex models can be used in the analyses if preferred using the same basic principles. As can be seen from Figure 1 large deformation can occur beyond the elastic limit. This ability to undergo
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Stress-induced amorphization triggers deformation in the
· Deformation experiments were performed under a confining pressure of 300 ± 5 MPa at temperatures between 900 °C and 1200 °C and at a constant displacement rate.
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